# （1）分别定义字符串、列表、元组、字典变量；
s = "itheima"
print(type(s)) # <class 'str'>
print(s.upper().islower())

l = ['itheima', 'itcast', 'bigdata', 1]
print(type(l)) # <class 'list'>
print(len(l))

t = ('itheima', 'itcast', 'bigdata', 2)
print(type(t)) # <class 'tuple'>

d = {'itheima': s, 'itcast': t, 'bigdata': s}
print(type(d)) # <class 'dict'>

# （2）使用【type(变量名)】查看变量的类型；
